Finding the Fourth Proportional to 13,116.99, 18,086.85 and 10,279.29

Step by Step Solution

1. Step 1: Write the proportion equation
   13,116.99 : 18,086.85 = 10,279.29 : x
2. Step 2: Convert to fraction form
   13,116.99/18,086.85 = 10,279.29/x
3. Step 3: Cross multiply
   13,116.99x = 18,086.85 × 10,279.29
4. Step 4: Simplify right side
   13,116.99x = 185,919,976.34
5. Step 5: Solve for x
   x = 185,919,976.34/13,116.99
6. Step 6: Final answer
   x = 14,173.98